法国巴黎盆地枫丹白露砂岩电性响应特征  

Electrical response characteristics of Fontainebleau sandstone in Paris Basin,France

作　　者：李晓 李闽[1] 陈猛[1] 唐雁冰[1] LI Xiao;LI Min;CHEN Meng;TANG Yanbing(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]油气藏地质及开发工程国家重点实验室.西南石油大学,成都610500

出　　处：《岩性油气藏》2019年第1期130-138,共9页Lithologic Reservoirs

基　　金：国家重点基础研究发展(973计划)项目"致密油多相多尺度流动机理及渗流理论研究"(编号:2015CB250902);石油化工联合基金(A类)项目"致密气多相多尺度流动规律及跨尺度耦合渗流"(编号:U1562217)联合资助

摘　　要：获取准确的电性特征参数是进行储层含油气饱和度评价的基础。选取不同物性范围内的9块法国巴黎盆地枫丹白露砂岩样品,开展岩石电性参数室内测试,并基于逾渗理论分析,提出了能表征储层岩石电性特征的新模型,并采用阿尔奇(Archie)公式和新模型对实验数据进行拟合分析。研究表明:高孔渗岩样的电性关系与经典Archie线性关系匹配较好,呈线性关系;中、低孔渗岩样在低含水饱和度条件的电性关系与Archie线性关系均出现一定程度偏离,表现为明显的非Archie特征,分析认为复杂的微观孔隙结构是诱发储层的电性关系与Archie线性关系为非线性关系的主要因素;基于Archie公式得到的饱和度指数n为0.948～1.820,与渗透率的平方相关性较好,与孔隙度的平方相关性较差;胶结指数m为1.6～1.9,岩性系数b为1.003～1.036,二者与孔隙度、渗透率的相关性均较差。研究认为新模型能更准确地表征复杂岩石电性的非线性特征,进一步丰富了储层含油气饱和度的评价方法。The assessment for oil and gas saturation of reservoir rock is based on acquiring accurate electrical characteristic parameters. Nine samples of Fontainebleau sandstone with different physical properties in Paris Basin of France were selected to carry out laboratory testing of rock electrical parameters. On the basis of percolation theory,a new model was proposed to characterize the electrical characteristics of reservoir rocks,and the experimental data were fitted and analyzed by Archie formula and new model. The results show that the electrical property relationship of high porosity and permeability rock samples matches well with linear relationship of Archie’s formula,showing a linear relationship. The electrical property relationship of medium and low permeability rock samples under low water saturation partly deviates from Archie linear relationship,showing obvious non-Archie features. It is considered that the complex micro-pore structure is the main factor inducing the non-linear relationship between the electrical properties of reservoirs and Archie's linear relationship. The saturation index n obtained by Archie formula is 0.948-1.820,which has a good correlation with the square of permeability and a poor correlation with the square of porosity. Cementation index m is 1.6-1.9,and lithology coefficient b is 1.003- 1.036,both of which have poor correlations with porosity and permeability. The new model can accurately characterize the non-liner characteristics of rock electrical properties and enrich the evaluation methods of reservoir oil and gas saturation.

关 键 词：岩电参数 地层因素 电阻率指数 非Archie现象 含油气饱和度 枫丹白露砂岩 巴黎盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]